The temperate grasslands of South America are found in the geographic region of Patagonia. The grasslands of Patagonia are cold and temperate with less than 100 frost-free days a year and constant, strong winds. Dominant genera common to the Patagonia grasslands include Adesmia, Chuquiraga, Fabiana, Lepidophyllum, Mulinum and Nardophyllum. Grazing by domestic livestock, primarily sheep and cattle has occurred for over a century in the Patagonian grasslands. Soils are of a sedimentary base, but have varying distributions of volcanic material from the Mesozoic and Tertiary eras